Trailer visibility safety system

ABSTRACT

A safety lighting system for use with trailers is described herein. In some embodiments, the trailer lighting system comprises a sensor, a controller, and safety lights. The safety lighting system may be used for illuminating trailers while being towed, for example, in shipping yards, construction yards, and shipping and receiving docks. The safety lighting system may be activated upon connection of a pneumatic system with a spotting tractor and deactivated upon establishing an electrical connection from a tractor to the trailer.

RELATED APPLICATIONS

This non-provisional patent application claims priority benefit, withregard to all common subject matter, of earlier-filed U.S. ProvisionalPatent Application No. 62/572,070, filed Oct. 13, 2017, and entitled“TRAILER VISIBILITY SAFETY SYSTEM.” The identified earlier-filedprovisional patent application is hereby incorporated by reference inits entirety into the present application.

BACKGROUND 1. Field

Embodiments of the invention are broadly directed to safety lightingsystems for semi-tractor trailers that enhance visibility to reduce thelikelihood of accidents. More specifically, embodiments of the inventionprovide trailer safety lighting systems that detect connectionsestablished between the trailer and a tractor to selectively activateattention-drawing lights.

2. Related Art

The yard of a distribution warehouse facility that loads, unloads,and/or maintains semi-tractor trailers can be a busy, dangerous place.As drivers of spotting tractors move trailers from one dock to another,it is difficult for drivers and pedestrians to remain constantly awareof every tractor and trailer. Particularly when several trailers arebeing loaded, unloaded, maintained, and moved simultaneously, a lack ofsufficient attention or visibility often leads to collisions. This canresult in injury to people and damage to property, as well as time lost.Accidents can be reduced by activation of safety lighting on a trailerbeing moved or maintained.

Accidents can occur when trailers are being moved about a distributionwarehouse yard, often due to circumstances that might have been avoidedwith increased awareness and/or visibility. Safety lighting systemsattached to a trailer can help address these problems, but requirepower. Safety lighting systems attached to spotting tractors have proveninsufficient, since the taller trailer blocks much of the lightproduced.

Conventional methods of providing safety lighting incorporate one ormore beacon lights onto the cabs of spotting tractors used at awarehouse facility. This solution has proven insufficient due to theheight difference between the spotting tractor and the trailer beingtowed. Typically, a trailer is substantially (several feet) taller thana spotting tractor, blocking a portion of the light produced by beaconsaffixed to the tractor's cab. As such, these methods fail to provide acomplete 360° of visibility.

Another possible solution involves use of the over-the-road lightingsystems that are manufactured into trailers (such as running lights,tail lights, brake lights, turn signals, etc.) to provide safetylighting. This solution requires the driver of a spotting tractor toestablish an electrical connection between the spotting tractor and thetrailer, as if he is preparing to haul the trailer on public roads.Establishing this electrical connection can be very time- andeffort-intensive. Furthermore, it can often lead to costly damage ofelectrical cords or plugs. Additionally, the driver may simply forget orneglect to establish the electrical connection at all, resulting in acomplete lack of safety lighting.

Another possible solution involves activating trailer lights manually bya driver or maintenance person attaching the tractor electrical systemto the trailer electrical system and incorporating lights on theexterior of the trailer. This adds an extra step when coupling thetractor to the trailer increasing complexity and decreasing efficiency.This may also result in a driver or maintenance person forgetting todecouple the tractor from the trailer potentially causing injury to aperson and damage to property.

What is needed is a convenient, dependable safety lighting system forsemi-tractor trailers that provides high visibility in all directionsfor a trailer being moved or maintained while requiring minimaladditional setup or control by the driver of a spotting tractor.Further, the safety lighting system should not activate when the traileris attached to a road tractor, so that the system goes unnoticed bydrivers having no need for its function.

SUMMARY

Embodiments of the invention solve these problems by providing a systemfor increasing the visibility of a trailer when the trailer is attachedto a pneumatic line of a tractor. In a first embodiment of theinvention, a safety lighting system for illuminating a trailer comprisesa safety light configured to be emplaced on an exterior surface of thetrailer, a power source, and a controller configured to detect if apneumatic connection has been established between the trailer and atractor, detect if an electrical connection has been established betweenthe trailer and the tractor, and activate the one or more lights if thepneumatic connection has been established and the electrical connectionhas not been established.

A second embodiment is directed to a safety lighting system forilluminating a trailer, comprising one or more lights disposed on anexterior surface of a trailer, a power source, a sensor, and acontroller, wherein the sensor is configured to send a signal indicativeof a pressure from a pneumatic connection, and wherein the controller isconfigured to activate the one or more lights based on the detection ofthe signal indicating that the pressure is above a minimum threshold.

A third embodiment is directed to a method for illuminating a trailerusing a safety lighting system, the method comprising the steps ofdetecting, using a pressure sensor, a pressure from a pneumatic lineconnected from a tractor to the trailer, detecting, using an electricalsensor, that an electrical connection has not been established betweenthe tractor and the trailer, activating, based on the detection that thepneumatic line is connected and the detection that the electricalconnection is not established, at least one light using a power sourcelocated on the trailer; and deactivating the at least one light upondetection that the electrical connection between the tractor and thetrailer is established.

This summary is provided to introduce a selection of concepts in asimplified form that are further described below in the detaileddescription. This summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used to limit the scope of the claimed subject matter. Other aspectsand advantages of the invention will be apparent from the followingdetailed description of the embodiments and the accompanying drawingfigures.

BRIEF DESCRIPTION OF DRAWINGS

Embodiments of the invention are described in detail below withreference to the attached drawing figures, wherein:

FIG. 1 depicts an exemplary embodiment of a tractor and trailer system;

FIG. 2 depicts an diagram representing an exemplary embodiment of asafety lighting system;

FIG. 3 depicts an exemplary embodiment of a coupling system of a tractorand trailer system;

FIG. 4 depicts an exemplary embodiment of a control box for controllinga trailer lighting system;

FIG. 5 depicts an exemplary embodiment of a schematic for operation of asafety lighting system;

FIG. 6 depicts an exemplary embodiment of a controller for a safetylighting system; and

FIG. 7 depicts a flow chart representing an exemplary method foroperating embodiments of the invention.

The drawing figures do not limit the invention to the specificembodiments disclosed and described herein. The drawings are notnecessarily to scale, emphasis instead being placed upon clearlyillustrating the principles of the invention.

DETAILED DESCRIPTION

Embodiments of the invention are directed to a safety lighting systemthat provides one or more safety lights on the exterior surface of atrailer coupled to a power source and a controller. In embodiments ofthe invention, the controller is configured to sense if a pneumaticconnection has been established between the trailer and a tractor.Further, in embodiments of the invention, the controller is configuredto sense if an electrical connection has been established between thetrailer and a tractor. Further yet, in embodiments of the invention, thecontroller is configured to activate the one or more safety lights if apneumatic connection has been established and an electrical connectionhas not been established between the trailer and the tractor. Since thepneumatic connection typically releases the trailer brakes allowing thetrailer to be moved the safety lights will be on when the trailer is inmotion. Further, since the electric connection is established to tow thetrailer along the roadway, the safety lights may not be necessary thuswhen the electric connection is established the safety lights may bedisabled.

The following description of embodiments of the invention references theaccompanying illustrations that illustrate specific embodiments in whichthe invention can be practiced. The embodiments are intended to describeaspects of the invention in sufficient detail to enable those skilled inthe art to practice the invention. Other embodiments can be utilized andchanges can be made without departing from the scope of the invention.The following detailed description is, therefore, not to be taken in alimiting sense.

In this description, references to “one embodiment,” “an embodiment,” or“embodiments” mean that the feature or features being referred to areincluded in at least one embodiment of the technology. Separatereferences to “one embodiment,” “an embodiment,” or “embodiments” inthis description do not necessarily refer to the same embodiment and arealso not mutually exclusive unless so stated and/or except as will bereadily apparent to those skilled in the art from the description. Forexample, a feature, structure, act, etc. described in one embodiment mayalso be included in other embodiments, but is not necessarily included.Thus, the current technology can include a variety of combinationsand/or integrations of the embodiments described herein.

A tractor is a semi-tractor, road tractor, truck, car, recreationalvehicle, or any other vehicle that may be used to tow a trailer. Typicaltractors seen on the open highway are known as “road tractors,” whichare typically larger than spotting tractors. As mentioned above, in aloading and unloading environment, such as a distribution warehouseyard, spotting tractors are used to quickly shuffle trailers betweenvarious locations such as docks, maintenance areas, and parking zones.

In order to move a trailer, the driver of any tractor, spotting or road,must first establish a pneumatic connection between the tractor and thetrailer. This pneumatic connection supplies the necessary air pressurefor releasing the trailer's brakes. The trailer brakes are locked whenthe trailer is not connected to the tractor and when connected to thetractor the brakes typically automatically unlock when a servicepneumatic line is attached. When preparing to haul the trailerover-the-road, the driver must also establish an electrical connectionbetween the road tractor and the trailer in order to power systems suchas the trailer's running lights, tail lights, brake lights, turnsignals, etc. However, these systems require power from the electricalconnection and are not absolutely necessary when moving the trailer withthe spotting tractor in a warehouse environment. In the interests ofspeed, increased efficiency, and decreased wear on cords and plugs asdiscussed above, typically electrical connections are not establishedbetween trailers and spotting tractors in such an environment. Thiscauses the trailers to not be lit and thus not as visible as trailers onthe roadway.

Embodiments of the invention may provide heightened visibility andawareness of the trailer to other drivers and bystanders. Embodimentsmay provide attention-grabbing lighting such as in a full 360° range ofvisibility around the trailer. Embodiments of the safety lighting systemmay be incorporated into the trailer at the time of its manufacture. Inalternative embodiments the safety lighting system may be added to thetrailer after market. Embodiments of the invention may includecomponents integrated into control or support structures of tractorsand/or trailers, such as a dashboard or a throttle, or may be completelyfreestanding. Lights and/or controllers in embodiments of the inventionmay be mounted at any location or set of locations on the trailer.

Broadly, some embodiments of the invention comprise a plurality ofsafety lights coupled to a controller and a power source. The safetylights may be light-emitting diode (LED) “bullet” lights, or any othertype of safety light. The controller may be automatically activated upondetection of a pressure source such as from a service pneumatic lineattachment. In some embodiments, when the service pneumatic line isattached a pressure sensor may sense the pressure and send a signal tothe controller. Upon receiving the signal from the pressure sensor, thecontroller may monitor the signal. When the signal indicates that aminimum pressure threshold has been reached the controller may signalthe lights to activate. The lights may strobe, remain constant, or maybe different colors depending on the different signals that may be usedto indicate different modes.

Embodiments of the invention provide a safety lighting system attachedto a trailer that does not require power from an electrical connectionestablished between the trailer and a tractor. Rather, embodiments ofthe invention are powered by a power source mounted at a location on thetractor, such as, for example, on its under side. Further, embodimentsof the invention do not require a driver to manually activate thesystem. Rather, embodiments of the invention activate automatically whena pneumatic connection is established between the trailer and a tractor.This sensing, for example, may comprise measuring a “high” voltagereading (12 V) on a line coupled to a pressure sensor on a pneumatichose when the pneumatic connection is established, and measuring a “low”voltage reading (0 V) when the pneumatic connection is not established.Such a configuration provides safety lighting that cannot be forgotten,neglected, or circumvented, since the air pressure supplied by thepneumatic connection is necessary to release the trailer's brakes.

Turning first to an exemplary embodiment of a tractor-trailer 100including a tractor 102 and a trailer 104 depicted in FIG. 1 where thetractor 102 is coupled to the trailer 104 for transport. The tractor 102may be a spotting tractor and may be coupled to the trailer 104 fortransport around a distribution yard or shipping and receiving docks atwarehouses or shore docks. The tractor 102 may be specifically designedfor this activity however in some embodiments a “road” tractor, car,truck, recreational vehicle, or any other vehicle that may be capable oftowing the trailer 104.

Similarly, the trailer 104 as depicted is a semi-trailer. In someembodiments, the trailer 104 may carry vehicles, animals, food/drinkand/or refrigerated items, or any other item, product, or good that mayneed to be transported. The trailer 104 may have safety lights 106mounted on any portion of the trailer 104 to increase visibility andawareness to nearby workers and other drivers. The safety lights 106 maybe mounted on the upper edges 108 the lower edges 110 the vertical edges112 or on any side or face. These configurations are merely examples andthe safety lights 106 may be mounted anywhere on the trailer 104 toincrease visibility.

The safety lights 106 may be mounted at any set of desired locations,and may be movable by a driver to different locations on the trailer104. The lights 106 may be permanently built into the structure of thetrailer 104, removably mounted with hardware such as screws or bolts,magnetically affixed, and/or mounted to a set of docking stations thatare otherwise affixed to the exterior surface of the trailer 104.

The safety lights 106 may be included in a safety lighting system thatcontrols the lights 106 to display indicative of the state of thetrailer 104. For example, the trailer 104 may not be coupled to thetractor 102 or may be coupled to the tractor 102. Further, the trailer104 may be coupled to the tractor 102 pneumatically, electrically, ormechanically. Generally, the safety lighting system may indicate themode of the trailer 104 for signaling workers such that the state of thetrailer 104 is known. In general, the safety lighting system maycomprise an input, either such as a sensor or interface, a controller,and lights and is discussed in more detail below.

In some embodiments the spotting tractor 104 may not be a spottingtractor and the trailer 104 may not be a standard trailer. In someembodiments, the trailer 104 may be permanently attached to the tractor102 and optionally electrically or pneumatically attached and in someembodiments the trailer 104 and tractor 102 are separate and can bemechanically coupled as well. In some embodiments, the spotting tractor104 may be a recreational vehicle, automobile such as a truck, bus, orcar, or, in some embodiments, a train. In some embodiments, the trailer104 may be a refrigeration trailer, towing trailer for towing a vehiclesuch as a car, boat, or truck. In embodiments, the trailer 104 may beconnected to the tractor 102 such as the bed of a pickup truck or acement mixer. Many embodiments and configurations of a trailer 104 andsafety lighting system may be imagined in which a safety lighting systemas described in embodiments may be used with many embodiments of atrailer 104.

FIG. 2 depicts an exemplary safety lighting system 114 for controllingthe safety lights 106 for some embodiments of the invention comprising apower source 115, a sensor 116, a controller 118, and the safety lights106. In some embodiments the controller may connected to a network 117for wireless transmission. The description provided herein is a highlevel overview of major components in embodiments of the invention. Amore detailed a description is provided below. Generally, a sensor 116detects a mode of the trailer 104 or an input to the trailer 104. Insome embodiments, the sensor 116 detects a pneumatic connection andsends an electrical signal to the controller 118. The controller 118 maycontrol the function of the safety lights 106 based on the signalreceived from the sensor 118. The controller 118 may also have storedfunctionality that controls the safety lights 106 based on time, anynumber of electrical, pneumatic, mechanical, or hydraulic connections orinputs. The controller 118 may also interface with a user via userinputs or wireless communication via infrared, radio frequencycommunication, or via the internet provided by a server. As such,embodiments of the invention may incorporate structures facilitatingwireless communication, such as a wireless Internet modem and/orcellular telephone antenna for transmission over the network 117.

Turning now to an embodiment of the invention depicted in FIG. 3presenting a coupling 120 between the spotting tractor 102 and thetrailer 104. The spotting tractor 102 is electrically connected to thetrailer 104 by the electric line 122 which may connect to the trailer104 using a 7-pin connector. Though a 7-pin connector is typical in thefield and described in embodiments of the invention, any connector maybe used that transfers electrical signals from the spotting tractor 102to the trailer 104. In embodiments, the electric line 122 may not needto be connected to activate the safety lights 106. In some embodiments,connecting the electric line 122 disables the safety lights 106. Thespotting tractor 102 is further connected to the trailer 104 by twopneumatic lines; a service line 124 and an emergency line 126. A stingerline 128 is also connected between the spotting tractor 102 and thetrailer 104. The stinger line 128 typically carries electrical power andground for batteries on the trailer to operate additional, or optional,features such as a liftgate or a refrigeration system.

In order to move the trailer 104, the driver of any tractor, spotting orroad, must first establish a pneumatic connection between the tractor102 and the trailer 104. This pneumatic connection supplies thenecessary air pressure for releasing the trailer's 104 brakes. Thepneumatic connection may be established between the trailer 104 and thetractor 102 via the service line 124 and the emergency line 126. Whenpreparing to haul the trailer 104 over-the-road, the driver must alsoestablish an electrical connection between the road tractor and trailer104 in order to power systems such as the trailer's running lights, taillights, brake lights, turn signals, etc. The electrical connection maybe established via the electrical line 122. Typically, these systemsrequire power from the electrical connection and are not absolutelynecessary when moving the trailer 104 with the spotting tractor 102 in awarehouse environment. In the interests of speed, increased efficiency,and decreased wear on cords and plugs, typically electrical connectionsare not established between trailers and spotting tractors in such anenvironment.

In some embodiments, the safety lighting system 114 may detectconnection of the service line 124. The sensor 116, in some embodimentsa pressure sensor, may be used to detect the pressure supplied when theservice line 124 is connected. The controller 118 coupled to or housingthe sensor 116 may receive signals from the sensor 116 and control thesafety lights 106 based on the signals. For example, the controller 118may require a minimum pressure threshold before signaling the safetylights 106 to activate. This ensures that the safety lights 106 may notbe accidentally activated. Since the service line 124 must be connectedto move the trailer 104 the pressure in the service line 124 required torelease the trailer 104 brakes is known. The minimum pressure thresholdmay be a constant value or a function of the required pressure, or theexpected pressure, to release the brakes. Any mathematical function orconstant value associated with the pressure sensor output may be used asa pressure threshold value for activation of the safety lights 106. Insome embodiments, multiple pressure threshold values may be used toproduce different light modes such as different colors, lightingcombinations, or different blinking patterns. The safety light 106display may be indicative of the mode of the trailer 104 or tractor 102.

The emergency line 126 may be coupled to the trailer 104 and may controlthe trailer 104 emergency braking system. The emergency line 126 mayprovide air to the trailer brake system air tanks and energy to thebrakes to enable the emergency brakes to activate. The emergency brakesmay activate when an emergency is detected such as unexpected release inpressure or activation by the driver. The unexpected release in pressuremay be the result of a loss in pressure in the air system due to damageor disconnect of the air couplers and/or hoses or activation by thedriver. In embodiments described herein, only the service line 124 isused for activation of the lights 106 however, it can be imaged that theemergency line 126 or any other pneumatic, hydraulic, or electrical lineor mechanical connection may be used.

Activation of the safety lighting system 114 would not typically benecessary for trailers being hauled over-the-road, whether or not apneumatic connection has been established. Typically, establishment ofan electrical connection between the trailer 104 and the tractor 102indicates that a driver is intending to haul the trailer over-the-road.Embodiments of the invention are configured to sense that the electricalconnection has been established between the trailer 104 and a tractor102 using the electrical line 122, and deactivate the safety lights 106regardless of the establishment of a pneumatic connection. This sensing,for example, may comprise measuring a “high” voltage reading (12 V) onthe electric line 122 coupled to a 7-way plug when the electricalconnection is established, and measuring a “low” voltage reading (0 V)when the electrical connection is not established. Typically, 7-wayplugs include a hot wire that transfers 12 volt power. The pinconnecting to the hot wire may be sampled to determine if the 7-way plugis connected. When the hot wire (12 Volts) is detected it may bedetermined that the electrical connection is established and that thetrailer 104 is to be towed on the roadway. Thus the controller 118deactivates the safety lights 106.

Further, in some embodiments, the attachment of the electric line 122may also indicate that the safety lighting system 114 batteries shouldbe charging. The safety lighting system 114 may be powered by a powersource 115. In some embodiments, the power source 115 may be a batteryor a plurality of batteries. The safety lighting system 114 batteriesmay include at least one battery controller detecting the state of thebatteries and controlling a current to the batteries for charging. Insome embodiments, the current may flow from a power source 115 on thetractor 102. The current may flow from the tractor 102 via either thestinger line 128 or via the electric line 122. The electric line 122 mayuse power generated by the tractor 102 to power the lights, bake lights,reverse lights, blinkers, refrigeration, or any other electrical systemon the trailer 104 as well as charge the safety lighting system 114batteries.

In some embodiments, the stinger line 128 may also be used as a powersource 115 to charge batteries for the safety lighting system 114. Thesafety lighting system 114 batteries may be charged while the spottingtractor 102 is connected to the trailer 104. The safety lighting system114 batteries may also be charged from a road tractor via stinger line128 while the trailer 104 is be towed on a roadway. This may providefull charge to the batteries allowing many hours of operation for thesafety lighting system 114 while the safety lighting system is notconnected to a power generating power source 115.

In some embodiments, power storing devices such as, for example,batteries and power generating devices such as, for example, motors maybe referred to generally as power sources. The power source 115 inembodiments described herein may be a battery, but this is not intendedto be limiting. In alternative embodiments, the power source 115 mayinclude one or more solar panels, an engine, and/or capacitors.Additionally, the alternative power sources 115 may be connected to apower source battery or the safety lighting system 114 battery to storethe generated energy. In some embodiments the power source 115 may bemoving parts of the trailer 104 itself. For example, a generator may beconnected to the wheels of the trailer 104 and charge the batteries asthe trailer 104 is transported from dock to dock or along the roadway.In some embodiments, the batteries store the energy generated by thewheel/generator combination. Any source of power is intended as beingwithin the scope of embodiments of the invention.

In embodiments of the invention, the driver may manually activate thesafety lighting system 114 regardless of whether or not pneumatic and/orelectrical connections have been established. This may be useful inemergency situations, such as when a road tractor has a breakdown or thetrailer 104 needs maintenance without a tractor 102 attached in adistribution warehouse yard. In alternative embodiments, the driver maymanually activate the safety lighting system 114 only if the pneumaticconnection has been established, but regardless of whether or not theelectrical connection has been established. In embodiments of theinvention, a driver may manually deactivate the safety lighting system114, even though a pneumatic connection has been established and anelectrical connection has not been established.

FIG. 4 depicts an exemplary control box 130 housing the controller 118and sensor 116 for operating the safety lights 106 in embodiments of theinvention. In some embodiments, manual activation and/or deactivation ofthe safety lighting system 114 may be accomplished by controls (buttons,switches, etc.) mounted on the control box 130 and/or mounted on thetrailer 102. Additionally or alternatively, in embodiments of theinvention, manual activation, operation, and/or deactivation of thesafety lighting system 114 may be accomplished by controls locatedwithin the cab of a spotting or road tractor. Additionally oralternatively, in embodiments of the invention, manual activation,operation, and/or deactivation of the safety lighting system 114 may beaccomplished by remote connection from an administrative facility, suchas a manager's computer or a location-tracking security system. As such,embodiments of the invention may incorporate structures facilitatingwireless communication, such as a wireless Internet modem and/orcellular telephone antenna and may be mounted in the control box 130.Additionally or alternatively, in embodiments of the invention thesafety lighting system 114 may be activated, operated, and/ordeactivated upon sensing of other triggers, such as air bag deploymentor hazard light activation. Any appropriate parameter that may be sensedby systems carried by the tractor 102 or trailer 104, such as GPSlocation, speed, hazard light activation, air bag deployment, oraccelerometers may be used as activation and/or deactivation triggers inembodiments of the invention.

In some embodiments of the invention continuing with the illustration inFIG. 4, the control box 130 may comprise external operational componentsas depicted such as a service line coupler 132, a power line 134, alighting harness 136, a user input 138, a Light Emitting Diode (LED)140, and a fuse block 142. Further, the control box 130 may house orcomprise any number and combination of processors, controllers,integrated circuits, programmable logic devices, switches, wires, fuses,relays, and/or other data and signal processing devices for carrying outthe functions described herein. A controller which, in some embodiments,may be housed within the control box 130 may include memory that maystore programmable instructions, including but not limited to volatileand/or non-volatile memory. The control box 130 may be mounted at anylocation on the trailer 104, including the roof, underneath, sides,front, or back. In some embodiments and additionally to the componentsdepicted, the control box 130 may include external control inputstructures such as input 138 or additional switches, buttons, keys, etc.for manual control of the safety lighting system 114, as furtherdescribed below. These external control input structures are notintended to be limiting—any structure by which a driver may manuallyinput information to operate the safety lighting system 114 is intendedto be included within embodiments of the invention.

In some embodiments, the control box 130 comprises a service coupler132. The service coupler 132 may be spliced into the service line 118with a T-Valve, T-coupler, or by any method that allows the sensor 116in communication with the controller 118 to be in fluid communicationwith the pressure source. The sensor 118 may be in electriccommunication with the controller 118 and when a pressure of a minimumthreshold is detected the controller 118 signals the safety lights 106to activate, change modes, or deactivate. The controller 118 may beprogrammed to control the safety lights 106 at different stages ofpressure such that some lights of the plurality of safety lights 106turn on or off automatically at different pressures, times, or manually.This may indicated different stages, different trailer ratings, ordifferent size trailers based on the pressure needed for the trailer104.

In some embodiments, the control box 130 may be connected to the powersource 115 via the power connector 134. As mentioned above, inembodiments of the invention, the power source 115 may charge when anelectrical connection is established between the trailer 104 and atractor 102. For example, a battery powering an embodiment of theinvention may charge when the trailer 104 is electrically connected tothe tractor 104 via the electric line 122 which may include a 7-wayplug. This may occur automatically, or may be activated by the driver.The safety lighting system 114 may alert the driver when the chargelevel of the power source 115 falls below a preset threshold. Such analert may be presented as an audible alarm, visible light, readabletext, or any other form appropriate for informing the driver.Alternatively or additionally, in embodiments of the invention, thepower source 115 may be charged via a separate charging line connectedto the power source 115. In embodiments of the invention, the powersource 115 may be partially or completely housed within the control box130.

The controller 118, which may be housed in the control box 130 maycontrol the function, behavior, and operation of the safety lights 114.As such, in embodiments of the invention the controller 118 is coupledto each of the safety lights 106 mounted on the trailer. The controller118 may be coupled to the safety lights 106 via the lighting harness136. The lighting harness 136 may couple the controller 118 to eachlight of the safety lights 106 or may couple to a light bar thatcomprises a plurality of lights. The lighting harness 136 may compriseany number of pins that allows the controller 118 to control all safetylights 106 simultaneously through either a light bar configuration or anindividual light configuration.

In some embodiments, the controller 118 may control all safety lights106 with one signal or send different signals to different lights. Allsafety lights 106 may be the same or some lights may be different colorsor may illuminate in different patterns. In this sense the safetylighting system 114 may signal different colors and different strobingpatterns to signal different operational modes or warning indications toworkers. The different strobing patterns signaled by the safety lights106 may represent different situations. For example, all safety lights106 in an on mode may demonstrate that the trailer 104 is in motion.This may be detected by GPS, accelerometer, tire rotation, or a signalfrom the speedometer. Similarly, blinking safety lights 106 may indicatethat the trailer 104 pneumatic system is attached but the trailer 104 isstationary. In some embodiments, it may be useful to employ flashinghazard style safety lights 106 when the trailer 104 or tractor 102 isbroken down and no electrical power is accessible by the trailer 104 orwhen the trailer 104 is undergoing maintenance and a person is workingin, on, or below the trailer 104. This may signal a driver that a personis around the trailer 104 and that the trailer 104 is not to be moved.These modes may be controlled and/or programmed by the user or may beautomatic based on the condition of the trailer 104.

In some embodiments, the LED 140 illuminates when pressure is detectedby the sensor 116 connected to the service line 124. The LED 140 mayindicate that the service line 124 has been connected to service coupler132. This may indicate to the driver that a good connection has beenestablished and that the trailer 104 brakes are no longer engaged.Though, in embodiments described herein, the LED 140 illumination isindicative of a connection between the service line 124 and the servicecoupler 132, it can be imagined that the LED 124 may be in communicationwith the emergency line 126, stinger line 128, electric line 122, or anypneumatic, hydraulic, mechanical, or electrical line for indicating whena connection has been made.

In some embodiments, fuse block 142 is accessible on the exterior of thecontrol box 130. This allows the driver to easily change fuses andevaluate any electrical problems that may exist with the controller 118.The fuse block 142 is discussed in more detail below.

FIG. 5 depicts the inner circuitry of the exemplary controller 118. Theservice coupler 132 for receiving air therethrough is set in the controlbox 130 housing. At an interior side of the service coupler 132 is apressure sensor 144, which in some embodiments is sensor 116, fordetecting the air pressure supplied through the service coupler 132.Power is supplied to the pressure sensor 144, and to all electricalcomponents, an exemplary battery 146 (such as a 12-volt battery) which,in some embodiments may be power source 115, when the electric line 122is not attached. The battery 146 runs through the fuse block 142 andprovides power to a strobe pulse module 148, a maintenance emergencyswitch 150, a maintenance emergency LED 140, and a relay 152. The mainpower for the safety lighting system 114 is supplied from the powersupply via line 154 through the main fuse 156.

Continuing with the exemplary embodiment of the controller 118 depictedin FIG. 5, the fuse block 142 comprises five fuses. The main power fromthe power source 115 which in some embodiments is battery 146 to therelay 152 is provided through fuse 1 from the battery 146 via line 154.The power to the relay 152 is provided via line 154 through fuse 1 andalong line 158. This provides the power to the relay 152 from thebattery 146 when the 7-pin connector is not connected to the trailer104. When the electric power from the tractor 102 is connected to thetrailer 104, the power is provided via line 160 to fuse 3 of the fuseblock 142 and along line 162 to the relay 152. Line 160 and subsequentlyline 162 may be generally referred to as the hot wire for providing thepower from the 7-way plug of the tractor 102. If power is detected fromthe electric input from the tractor 102 then the relay 152 is switchedand the safety lights 106 are deactivated.

The relay 152 also receives a signal from the pressure sensor 144 vialine 164. The signal indicates if the pressure has reached a minimumthreshold to switch the state of the relay 152. When the pressure isconnected and above a minimum threshold and there is no electrical powerfrom the 7-way plug, the power is received from the battery 146. Whenthe 7-way plug is connected to line 160 the power supply from the 7-wayplug through fuse 3 is detected and the relay 152 is switched from thebattery 146. Power for other power needs of trailer 104 as discussed inembodiments above and for detection to deactivate the safety lightingsystem 114 may be provided through the main fuse via line 158 to fuse 3of the fuse block 142.

The battery 146 may also be charged from the 7-pin connector electricalpower from the tractor 104. Charge line 166 may spice into line 162 toprovide power to the battery 146 for charging.

The maintenance and emergency switch 150 activates when there is a lossof pressure from the service coupler 132 as detected by the pressuresensor 144. The power to the maintenance and emergency switch 150 isprovided by the power override line 168 from the pressure sensor 144.Power, including 12 volt power from the battery 146, is provided vialine 170.

An LED 140 may be included to indicate when the power is supplied to therelay 152 from the battery 146 indicating that the safety lightingsystem 114 is in operation. The LED 140 may be included at any portionof the circuit to indicate different modes or states of the circuit. TheLED may also be used on lines connected to and indicative of the stateof mechanical, electrical, pneumatic, or hydraulic connections.

A module power line 172 provides air-pressure-activated power from thebattery 146 when the pressure sensor 144 detects a pressure above theminimum threshold as described above. The strobe pulse module 148 sendsa signal along line 174 to the safety lighting harness 136 to light thesafety lights 106. The strobe pulse module 148 may be programmed tolight the safety lights in any manner as described above. In someembodiments, the strobe pulse module 148 is a Soundoff Signal ETLEDFC1model for controlling the lighting sequence of the safety lights 106.

Fuses 4 and 5 are reserved for optional use. Fuse 4 may be connected andprovide power therethrough to an alarm. The alarm may indicate when thepressure threshold at pressure sensor 144 has exceeded the minimumpressure threshold. Line 176 provides system ground and line 178provides relay ground.

Turning now to FIG. 6 depicting an exemplary embodiment of the safetylighting system 114 implemented on the trailer 104 during operation incombination with the spotting tractor 102 and including safety lights106. The exemplary safety lighting system 114 includes upper safetylights 180 on the trailer upper portion 182 and lower safety lights 184on the trailer lower portion 186. In some embodiments, rear upper safetylights 188 may also be placed on the trailer upper rear portion 190 andvertical safety lights (not shown) on the trailer vertical edges 192.The safety lights 106 may be operated manually or automaticallyilluminated when the service or emergency pneumatic lines are attached.The safety lights 106 may be automatically or manual deactivated whenthe power switches from the auxiliary power supply to the tractor powersupply as supplied by the electrical power connector as described above.Any combination of color, arrangement, and blinking pattern ofembodiments of the safety lights 106 and the safety lighting system 114as described above may be implemented on the trailer 104.

Some embodiments of the invention are depicted in the method 700presented in FIG. 7. In Step 702, a pressure sensor 144 is electricallyattached to a controller 118 and detects a pressure level in a pressureline connected from the trailer 104 to the tractor 102. The pressuresensor 144 may be attached to a pressure line of the trailer 104. Insome embodiments, the pressure line leads to the brakes and releases thebrakes from a locked position when the pressure is supplied. Thepressure sensor 144 may be spliced into the pressure line with a T-valveor three way pressure connector or coupler or in any way that allows thepressure sensor to be in fluid communication with the pressure source.The pressure detected may be supplied by the service line 124 of thetractor 102 as described above.

In Step 704, a signal representative of the pressure supplied throughthe pneumatic service line 124 is relayed from the pressure sensor 144to the controller 118 where a switch is activated when the signalindicates that the pressure is above a minimum threshold. When thepressure sensor 144 is in fluid communication with the pressure sourcesupplying pressure to the brakes, the minimum pressure threshold may beany pressure below the pressure required to release the brakes. Thisenables the safety lighting system 114 to be active at a lower pressurethan the brake release. This ensures that the safety lights 106 will beoperable if the brakes are released and the trailer 104 is mobile.

In Step 706, the controller 118 determines if the pressure is above aminimum pressure threshold to activate the safety lights 106. If thepressure is below the minimum pressure threshold then the controller 118continues to evaluate incoming signals from the pressure sensor 144 butthe safety lights 106 are not activated. If the signal is above theminimum pressure threshold the safety lights 106 are activated and thecontroller 118 continues evaluating signals from the pressure sensor144.

In Step 708, when the pressure is above the minimum pressure threshold,the controller determines if power is supplied from the tractor 103 via,in some exemplary embodiments, a 7-way plug. If the electricalconnection from the tractor 102 is not enabled the safety lights 106 areactivated and controlled using the controller 118 and powered from thepower source 115 as in a fifth step 710. The power source 115 may be abattery or a power generating device such as a generator attached to thewheels of the trailer 104 or any other moving parts, a motor, solarcells, wind mill, or any power generating device attached to thebattery. The safety lights 106 may be any color or may remain constantlylit or flash or all of the above as specified by a mode either manuallyor automatically controlled.

In Step 712, the connection from the tractor is enabled and the safetylighting system 114 is disabled. Detection of the electrical power fromthe tractor 102 turns off the power supply from the power source 115thus disabling the safety lighting system 114 on the trailer 104. Theregular operations of the trailer 104 are powered by the electricalconnection with the tractor 102. Establishing the electrical connectionfrom tractor 102 to the trailer 104 indicates that the trailer 104 is tobe towed on the roadway. The electrical systems of the trailer 104 arecontrolled by the connection with the tractor 102 and the safetylighting system 114 is typically not necessary.

At Step 714, when the electrical connection is not established, thesafety lighting system 114 is enabled until the pneumatic connection isdisconnected. Upon release of the pressure from the disconnect, thesafety lighting system 114 is deactivated.

In some embodiments of the method described above, any embodimentsdescribed within the method may be rearranged, omitted, or anyembodiments described above may be added as needed to other embodiments.

Embodiments of the invention have been primarily described in relationto a safety lighting system for semi-trailers, but this is not intendedto be limiting. Embodiments of the invention may be employed to provideenhanced visibility and safety for any type of towed body, such as aboat or pop-up camper. Additionally, embodiments could be intended foruse in maintenance or production facilities rather than distributionwarehouses. Any towed structure requiring safety lighting when used in aparticular setting is intended as being within the scope of theinvention.

Having thus described various embodiments of the invention, what isclaimed as new and desired to be protected by Letters Patent includesthe following:
 1. A safety lighting system for illuminating a trailer,comprising: a safety light configured to be emplaced on an exteriorsurface of the trailer; a power source; and a controller configured to—detect if a pneumatic connection has been established between thetrailer and a tractor, detect if an electrical connection has beenestablished between the trailer and the tractor, and activate the one ormore lights if the pneumatic connection has been established and theelectrical connection has not been established.
 2. The safety lightingsystem of claim 1, further comprising a pressure sensor in electricalcommunication with the controller for detecting when a pressure isapplied to the safety lighting system and sending a signal indicative ofthe pressure to the controller.
 3. The safety lighting system of claim2, wherein when the signal indicates that the pressure is detected thecontroller activates the one or more lights.
 4. The safety lightingsystem of claim 3, wherein the controller activates the one or morelights when the pressure is above a minimum threshold.
 5. The safetylighting system of claim 1, wherein the controller is further configuredto detect when a hot line of an electrical connector is connected to thetrailer from the tractor.
 6. The safety lighting system of claim 5,further configured with a switch to bypass the hot line of theelectrical connector for activating the at least one or more lights whenan electrical system of the tractor is connected to the trailer, andwherein the electrical connector is a 7-pin connector.
 7. The safetylighting system of claim 6, wherein the switch is activated ordeactivated based on triggers, wherein the triggers are at least one ofair bag deployment, hazard light activation, accelerometer measurements,GPS location, or speed.
 9. The safety lighting system of claim 1,wherein the power source is disposed on the trailer.
 10. The safetylighting system of claim 9, wherein the power source comprises at leastone battery that is configured to charge when the electrical connectionis established between the tractor and the trailer.
 11. The safetylighting system of claim 9, wherein the power source is a battery and ischarged by a solar panel disposed on the trailer.
 12. The safetylighting system of claim 9, wherein the power source is a battery and ischarged by a generator configured to change mechanical energy toelectrical energy.
 13. The safety lighting system of claim 9, whereinthe power source is a battery and the controller is further configuredto send an alert when the battery charge is below a minimum threshold.14. A safety lighting system for illuminating a trailer, comprising: oneor more lights disposed on an exterior surface of a trailer; a powersource; a sensor; and a controller; wherein the sensor is configured tosend a signal indicative of a pressure from a pneumatic connection,wherein the controller is configured to activate the one or more lightsbased on the detection of the signal indicating that the pressure isabove a minimum threshold.
 15. The safety lighting system of claim 14,wherein the controller is further configured for detecting when anelectrical connection has been established.
 16. The safety lightingsystem of claim 15, wherein the controller is further configured todeactivate the one or more lights when the electrical connection hasbeen established.
 17. The safety lighting system of claim 16, whereinthe at least one or more lights are mounted such that the one or morelights can be viewed from around the trailer, and wherein the one ormore lights are configured to strobe.
 18. The safety lighting system ofclaim 17, wherein the power source supplies power to the controller andthe power source is a battery, and wherein the battery is charged fromsolar panels disposed on the trailer.
 19. The safety lighting system ofclaim 14, wherein the controller is housed within a controller housingconfigured with user inputs for controlling and programming the safetylighting system, and wherein the controller housing is mounted on thetrailer.
 20. A method for illuminating a trailer using a safety lightingsystem, the method comprising the steps of: detecting, using a pressuresensor, a pressure from a pneumatic line connected from a tractor to thetrailer; detecting, using an electrical sensor, that an electricalconnection has not been established between the tractor and the trailer;activating, based on the detection that the pneumatic line is connectedand the detection that the electrical connection is not established, atleast one light using a power source located on the trailer; anddeactivating the at least one light upon detection that the electricalconnection between the tractor and the trailer is established.